I upgraded Mint from 20.3 to 21.1 today, and followed Abraunegg's directions here:

abraunegg/onedrive#2445

This let me install the latest OneDrive version - 2.4.25 on the updated distro. Initially, OneDriveGUI would run, but OneDrive wouldn't. I followed the instructions here and removed the 'force_http_2' option from the config:

abraunegg/onedrive#2063

Since doing this, OneDriveGUI has stopped running. I've downloaded the latest version - OneDriveGUI-1.0.2-x86_64.AppImage but have had no luck. I get a long error message containing 'Gtk-Message: 20:28:18.827: Failed to load module "xapp-gtk3-module"' and ending with 'KeyError: 'force_http_11'. I'll put the full message in a pastebin at the end.

It appears that having that line in the config stops OneDrive from running, but removing it stops OneDriveGUI from running.

Can you help me please?

Pastebin - https://pastebin.com/cjindmM2

EDIT: Sorry, the links were hidden. They should be visible now.